Tangential blower

Abstract

A tangential blower, especially one having small external dimensions, which is essentially improved in its noise behavior. The baffle plate of the blower has a particular curved or shell shaped construction, and the vortex former consists of three leg portions connected to one another.

What is claimed is: 
     
       1. A miniature tangential air blower comprising: a housing; a rotor having a radius; said rotor being rotatably mounted in said housing about a predetermined axis, said rotor including blades having edges extending parallel to said axis; a baffle plate fixed in said housing and partly enclosing said rotor; and a vortex former fixed in said housing, said baffle plate and said vortex former defining an inlet at one side of said housing and defining an outlet at the opposite side of said housing; said baffle plate and said vortex former being positioned to direct air in largely the same direction at the inlet and outlet, said housing having side walls at least partly enclosing said rotor, said baffle plate being largely spiral in shape and continuously departing from said rotor from a first point of closest proximity to the rotor, said baffle plate having a bent end, said vortex former having an inlet or suction sided leg which, from a second point of its greatest proximity to said rotor, continuously departs therefrom in an upstream direction as viewed in a direction of air flow, said inlet leg being substantially straight and having an imaginary straight continuation constituting a tangent to the rotor, said vortex former having a substantially straight central leg that has a length greater than one-fourth the rotor radius and that departs continuously from said second point at an angle δ from said tangent; the angle δ being sufficiently small such that an imaginary upstream extension of said central leg is spaced from said rotor; said vortex former having a pressure sided leg extending at an angle ε from said tangent in a curved or several times bent off manner to an edge of said housing; wherein ε being a plurality of times greater than δ.